JPH076596U - Partition plug structure in pipeline - Google Patents

Abstract

(57) [Summary] [Purpose] This relates to the partition plug structure in pipelines that is applied to the partition for preventing foreign matter from entering the piping system in the repair work of nuclear power plants. The partition plug functions at atmospheric pressure. The repair work of the pipeline is easy without bursting in the pipeline, and it is lightweight and easy to carry in and out of the pipeline with the partition plug structure. [Structure] A cylindrical rubber sheet adapted to the inner diameter of the pipeline,
Provided on the rubber sheet, a core metal fitting with a flange for sealing the end of the rubber sheet on the cylindrical central axis portion of the rubber sheet,
A partition plug structure consisting of a partition plug consisting of a pressure reducing device for making the rubber sheet a negative pressure, and a handle that can be attached to and detached from the partition plug and that can carry the partition plug into and out of the pipeline.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a partition plug structure in a pipeline, which is applied to a partition for preventing foreign matter from entering the piping system during repair work of a nuclear power plant.

[0002]

[Prior art]

 Conventionally, partition plugs in pipelines that have been used in the repair work of nuclear power plants are those in which a membrane is attached to a rubber tube, or rubber balls are pressurized and expanded with air to adhere them to the inner wall of the pipe. There were those in which cloth or nylon was attached to a frame so that it could be opened and closed like a umbrella with a link mechanism, and those in which divided disks were assembled in a pipe.

[0003]

[Problems to be solved by the device]

 (1) When a partition plug that expands a rubber tube under pressure is ruptured, it may become a foreign substance in the tubing system and slip into it.If pressurized air leaks, the partition plug may loosen and fall off. Yes, the reliability of the stopper is lacking.

(2) The link type partition plug is expensive to manufacture, heavy and difficult to handle, and cannot be removed by remote control if the mechanism for contracting it fails. There was a problem such as.

[0005]

[Means for Solving the Problems]

 The present invention solves the above-mentioned conventional problems, and includes a rubber sheet formed into a cylindrical shape that is covered with a sponge and fitted to the inner diameter of the pipe line, and a flange that seals the end of the rubber sheet on the cylindrical central axis portion of the rubber sheet. Equipped with a partition plug consisting of the attached core metal fittings and a pressure reducing device for making negative pressure inside the rubber sheet provided on the core metal fittings, and a handle that can be easily attached to and detached from the partition metal plugs to carry the partition plugs into and out of the pipeline. It is a partition plug structure in the pipeline.

[0006]

[Action]

 Since the partition plug contracts by applying a negative pressure to the inside, it can be easily transported from a part with a small pipe diameter to a part with a large pipe diameter to be plugged in a conduit with a different diameter. Further, when the stopper is plugged, it expands by opening the inside to the atmosphere, so that there is no rupture or shrinkage and a stable state can be maintained.

[0007]

【Example】

 FIG. 1 is a sectional view showing an embodiment of the partition plug structure of the present invention. The present invention is a partition plug structure used for a discharge nozzle of a pump for cooling a nuclear reactor. 1 is a pipe of the discharge nozzle of a pump casing, 2 is a weir provided in the pipe 1, 3 is a partition plug, and 4 is a partition plug. A cylindrical rubber sheet covering the sponge 5 and adapted to the inner diameter of the conduit 1, 6 (6a to 6c) is a circular flange for sealing the end of the rubber sheet 4, and 7 is a flange 6. A plurality of bolts to be tightened, 8 is a hollow core metal fitting in which a flange 6 for sealing the end of the rubber sheet 4 is attached to the cylindrical central axis portion of the rubber sheet 4, and a plurality of holes 9 are drilled. Reference numeral 10 is a vacuum hose connected to the core fitting 8 and forms a flow path for extracting and introducing air inside the partition plug 3 formed of the rubber sheet 4. Reference numeral 11 is a nut for fixing the flange 6 to the core fitting 8.

Reference numeral 12 is a handle, 13 is a T-shaped handle frame, 14 is a sleeve of a quick connector that is easily attached to and detached from the core fitting 8 of the partition plug 3, 15 is a pin for pulling the sleeve 14 in the axial direction, and 16 is a sleeve. A spring for pressing 14 axially, 17 a ball held by the sleeve 14 for preventing the core fitting 8 of the partition plug 3 and the handle frame 13 from being disconnected, and 18 a wire rope for activating the sleeve 14 remotely , 19 is a grip for pulling the wire rope 18, 20 and 21 are guide tubes of the wire rope, 22 is a balance weight of the handle frame 13, 23 is a nut, and 24 is a hanging tool mounting hole of the handle 12, which is partitioned by a crane. The stopper 3 and the handle 12 are hung and carried in and out of the pipeline 1.

In the embodiment, the handle 12 is for remote attachment / detachment because the radiation dose equivalent rate inside the pump casing is high and an operator cannot access the pipe line 1 to attach / detach the partition plug 3.

Next, the relationship between the partition plug 3 and the handle 12 will be described. The lower end of the handle frame 13 is branched into a T shape, one of which is connected to the partition plug 3 by a sleeve 14 of a quick connector via a ball 17 and the other of the partition plug 3 so that the horizontal state of the partition plug 3 can be maintained. A balance weight 22 for weight is provided.

Since the partition plug 3 is installed in the pipe line 1 part of the discharge nozzle in the back of the weir 2, when the partition plug 3 is attached, the vacuum hose 10 is evacuated to shrink the partition plug 3 and then the partition plug 3 is contracted. The handle 12 to which the stopper 3 is attached is hung by a crane (not shown) through the suspender attachment hole 24, the partition plug 3 is carried into the pipe line 1 of the discharge nozzle of the pump, and then the partition hose 10 is connected with the vacuum hose 10. Extract air into 3.

When the partition plug 3 is removed, the vacuum hose 10 is evacuated to shrink the partition plug 3, and then the handle 12 is hung by a crane to carry the partition plug 3 out of the pipe line 1 of the discharge nozzle.

The partition plug 3 and the handle 12 are separated from each other by pulling a grip 19 provided on an upper portion of the handle frame 13 and a pin 15 together with a pin 15 against a spring 16 via a wire rope 18 passing through the inside of the handle frame 13. Since the sleeve 14 of the connector is pulled and the ball 17 is disengaged, the core fitting 8 of the partition plug 3 and the sleeve 14 can be detached. Conversely, the partition plug 3 and the handle 12 can be attached to the core fitting 8 of the partition plug 3 by the handle frame. It can be easily attached by pushing the frame 13 and inserting the ball 17 through the sleeve 14 of the quick connector.

[0014]

[Effect of device]

 (1) Since the partition plug of the present invention functions at atmospheric pressure, it does not explode in the pipe system, and therefore repair work is done on pipe lines that are not allowed to be contaminated with foreign matter, such as the pipe system connected to the main equipment of a nuclear power plant. Is perfect for Also, since there is no possibility of contraction and falling off during use, the reliability of the stopper is improved.

(2) Since the partition plug and the accessory tool can be lightened, they can be easily carried in and out. (3) The manufacturing cost is low. And so on.

[Brief description of drawings]

FIG. 1 is a sectional view of a partition plug structure according to an embodiment of the present invention.

[Explanation of symbols]

 1 Pipeline of Discharge Nozzle 2 Weir 3 Partition Plug 4 Rubber Sheet 5 Sponge 6 (6a to 6c) Flange 7 Bolt 8 Core Metal 9 Hole 10 Vacuum Hose 11 Nut 12 Handle 13 Handle Frame 14 Sleeve 15 Pin 16 Spring 17 Ball 18 Wire Rope 19 Grip 20, 21 Guide tube 22 Balance weight 23 Nut 24 Lifting tool mounting hole

Claims (1)

[Scope of utility model registration request] 1. A rubber sheet formed into a cylindrical shape which is covered with a sponge and adapted to the inner diameter of a pipeline, and a core metal fitting having a flange for sealing an end of the rubber sheet attached to a cylindrical central axis portion of the rubber sheet, A partition plug comprising a decompression device for making a negative pressure inside the rubber sheet provided on the core metal fitting, and a handle which can be easily attached to and detached from the partition plug and which can carry the partition plug into and out of the pipeline. A partition plug structure inside the pipe.